Neck Flexion Induces Larger Deformation of the Brain Than Extension at a Rotational Acceleration, Closed Head Trauma

Figure 5

Two consecutive pressure recordings in the same animal at two locations, brainstem (BS) and paraflocculus cerebelli (a), and a subsequent one with one sensor in the brainstem and the second one deep in the cerebellum (b) at a low level sagittal plane flexion rotational acceleration. Note the difference in time between the appearance of pressure changes in the brainstem and in the cerebellum. A high level sagittal extension trauma (c) induced strong pressure amplitudes, initially overpressure followed by underpressure, with one sensor positioned in deep in the caudate head (basal ganglia) and the other one in the pons portion of the brainstem. The sensor in the brainstem indicates extended, persistent underpressure due to extensive deformation.

(a)

(b)

(c)